I met an issue is slave system time is not same as master system time when linuxptp and phc2sys are running, I think it is related to currentUtcOffset value.
Test environment is included three PCs(linux OS), one is master and two are slave. Before run linuxptp, I use “date –s“ command to set these three PC’s system time to be the same. First step, run linuxptp. When running linuxptp, the default currentUtcOffset value is 36 on master. Below show the command as master and slave Master: ptp4l -i enp1s0f0 -m -H ptp4l -i enp1s0f1 -m -H enp1s0f0 and enp1s0f1 on the same NIC card Slave 1: ptp4l -i enp1s0f0 -m -H -s Slave 2: ptp4l -i enp1s0f0 -m -H -s Second step, when linuxptp is locked, I am running phc2sys with following configuration on slave: phc2sys -s enp1s0f0 -c CLOCK_REALTIME -w Then, I compare the date between master and slave with the command “date”. I found that the time of two slaves is different from master. If I want to correct it, I have to set currentUtcOffset to -25 (pmc –u –b 0 “set GRANDMASTER_SETTINGS_NP) on master first, and run linuxptp and phc2sys on slave 1. Then set currentUtcOffset to -5 on master, and run linuxptp and phc2sys on slave 2. Why I need to set two different currentUtcOffset values? Is there has any method that I don’t need to set currentUtcOffset value every time when running linuxptp? Is the command “phc2sys -s enp1s0f0 -c CLOCK_REALTIME -w”(set on slave) is correct if I want to sync the system time of master and slave? Thanks Van Yu This e-mail and its attachment may contain information that is confidential or privileged, and are solely for the use of the individual to whom this e-mail is addressed. If you are not the intended recipient or have received it accidentally, please immediately notify the sender by reply e-mail and destroy all copies of this email and its attachment. Please be advised that any unauthorized use, disclosure, distribution or copying of this email or its attachment is strictly prohibited. 本電子郵件及其附件可能含有機密或依法受特殊管制之資訊，僅供本電子郵件之受文者使用。台端如非本電子郵件之受文者或誤收本電子郵件，請立即回覆郵件通知寄件人，並銷毀本電子郵件之所有複本及附件。任何未經授權而使用、揭露、散佈或複製本電子郵件或其附件之行為，皆嚴格禁止 。
_______________________________________________ Linuxptp-users mailing list Linuxptp-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/linuxptp-users
